The ULN2003A is a seven channel Darlington (NPN) array which able to control seven output.
Photos (with iBoard):
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This L293D is a Quadruple Half-H Drivers to drive the inductive loads (relays, DC and stepping motors).
4x3 Keypad is used to allow user to key in decimal number (0-9), * and # keys.
Pin Header (2.54mm, Straight, 2x6 Way, A:6mm)
usbLink is a USB to Serial Converter which can support UART port (TX/RX), 4x digital IO or 3x 10-bit ADC input.